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Help on virtual com port on STM32

Question asked by zhang.ning.001 on Feb 22, 2013
I had made a simple example which send data continously to PC through virtual com port based on FW lib 3.5.0 and USB lib 3.4.0 using IAR EWARM6.40 under WindowsXP and wanted to debug it using JLINK.When I plugged the device into USB port, the system recognized it as a "unknown usb device" automatically and did not popup a window for me to install driver manually(It is the same whether the jlink is connect or not). I had installed the virtual com port driver 1.3.1(I could not find the file stcdc.inf on ST website).